A Flexible Ascorbic Acid Fuel Cell with a Microchannel Fabricated using MEMS Techniques

Mogi, Hiroshi; Fukushi, Yudai; Koide, Shigeyo; Sano, Ryohei; Sasaki, Tsubasa; Nishioka, Yasushiro

doi:10.1088/1742-6596/476/1/012065

Cited by 13 publications

(3 citation statements)

References 22 publications

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“…The P max values of 4.4 and 8.8 μW/cm 2 at C glu = 0.05 and 2 mM, respectively, were greater than most P max values obtained from bendable fuel cells that operate at physiological conditions using tear components, e.g. , glucose, lactate, or ascorbate, as fuel (Figure D). − ,,− Among these fuel cells, stable power generation after bending has been demonstrated by only one . Moreover, most fuel cells are enzymatic and exhibit half-lives, i.e.…”

Section: Results and Discussionmentioning

confidence: 88%

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

et al. 2022

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Smart contact lenses have the potential to serve as noninvasive healthcare devices or virtual displays. However, their implementation is limited by the lack of suitable power sources for microelectronic devices. This Article demonstrates smart contact lenses with fully embedded glucose fuel cells that are safe, flexible, and durable against deformations. These fuel cells produced stable power throughout the day or during intermittent use after storage for weeks. When the lenses were exposed to 0.05 mM glucose solution, a steady-state maximum power density of 4.4 μW/cm2 was achieved by optimizing the chemistry and porous structure of the fuel cell components. Additionally, even after bending the lenses in half 100 times, the fuel cell performance was maintained without any mechanical failure. Lastly, when the fuel cells were connected to electroresponsive hydrogel capacitors, we could clearly distinguish between the tear glucose levels under normal and diabetic conditions through the naked eye.

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Section: Results and Discussionmentioning

confidence: 88%

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

et al. 2022

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“…Moreover, its maximum output power density outperforms many fuel cells such as direct photosynthetic biofuel cell (5.26 μW cm −2 ), microbial fuel cell (5.5 μW cm −2 ), glocuse fuel cell (1.45 and 230 μW cm −2 ), ascorbic acid fuel cell (1.83 μW cm −2 ), biofuel cell (120, 7.9, and 34.3 μW cm −2 ), enzymatic biofuell cell (12.5, 34.1, and 121 μW cm −2 ), and so forth (Figure 4j). [63][64][65][66][67][68][69][70][71][72] It should be noted that the carbon cloth used in FDUFC is a similar material to the gas diffusion layer in traditional proton exchange membrane fuel cell, while it has excellent mechanical and flexibility properties. It is desirable to use Ni foam as a support because it has a three-dimensional network structure, which exposes more active sites and ensures effective gas bubble release and electron/mass transfer.…”

Section: Electrochemical Performances and Entire Flexibility Of Direc...mentioning

confidence: 99%

Insights into the synergistic effect between nickel and molybdenum for catalyzing urea electrooxidation

Wang

Fei

et al. 2022

Carbon Neutralization

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The efficiency of many clean technologies, such as urea fuel cells, hydrogen production from urea-containing water splitting, and sewage treatment, and so forth, is restricted due to the sluggish kinetics of the urea oxygen reaction (UOR). Mo-doped Ni-based catalysts are excellent for UOR because of the synergistic effect between Ni and Mo. However, such applications have indeed been hampered by a lack of mechanistic comprehension. Here, we fabricate Mo-Ni(OH) 2 nanosheets for efficient UOR electrocatalysis with activity at least twice higher than Ni(OH) 2 nanosheets. Various in situ characterizations including Raman, differential electrochemical mass spectrometry and Fourier transform infrared spectroscopy reveals that the doping of Mo lowers the onset potential required for Ni 2+ /Ni 3+ conversion and promotes the coupling of the N-N bond inside the molecule and the fracture of the double bond between C and O in the urea molecule. In addition, an entirely flexible direct urea fuel cell with the Mo-Ni(OH) 2 electrocatalyst delivers a maximum output power density of 0.78 mW cm −2 and complete flexibility for the first time. Our research significantly promotes the mechanistic understanding of UOR electrocatalysis and its applications.

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“…As an advantageous supplementation to hydrogen fuel cells, low-temperature direct AA fuel cells (DAAFCs) have many potential applications in portable chargers, unmanned aerial vehicles, cochlear implants, and pacemakers [4][5][6][7][8]. Since Fujiwara et al first studied lowtemperature DAAFCs [9], many have contributed to this emerging field [10]. However, the development of DAAFCs has been seriously jeopardized by the slow kinetics of the AA oxidation reaction (AAOR) at the anode side.…”

Section: Introductionmentioning

confidence: 99%

An Unprecedented CeO2/C Non-Noble Metal Electrocatalyst for Direct Ascorbic Acid Fuel Cells

Qiu,

Zhou,

Gao

et al. 2023

Nanomaterials

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Direct ascorbic acid fuel cells (DAAFCs) employ biocompatible ascorbic acid (AA) as fuel, allowing convenient storage, transportation, and fueling as well as avoiding fuel crossover. The AA oxidation reaction (AAOR) largely governs the performance of DAAFCs. However, AAOR electrocatalysts currently have low activity, and state-of-the-art ones are limited to carbon black. Herein, we report the synthesis of an unprecedented AAOR electrocatalyst comprising 3.9 ± 1.1 nm CeO2 nanoparticles evenly distributed on carbon black simply by the wet chemical precipitation of Ce(OH)3 and a subsequent heat treatment. The resultant CeO2/C shows a remarkable AAOR activity with a peak current density of 13.1 mA cm−2, which is 1.7 times of that of carbon black (7.67 mA cm−2). According to X-ray photoelectron spectroscopy (XPS), the surface Ce3+ of CeO2 appears to contribute to the AAOR activity. Furthermore, our density functional theory (DFT) calculation reveals that that the proton of the hydroxyl group of AA can easily migrate to the bridging O sites of CeO2, resulting in a faster AAOR with respect to the pristine carbon, -COOH, and -C=O sites of carbon. After an i-t test, CeO2/C loses 17.8% of its initial current density, which is much superior to that of carbon black. CeO2 can capture the electrons generated by the AAOR to protect the -COOH and -C=O sites from being reduced. Finally, DAAFCs fabricated with CeO2/C exhibit a remarkable power density of 41.3 mW cm−2, which is the highest among proton-exchange-membrane-based DAAFCs in the literature.

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A Flexible Ascorbic Acid Fuel Cell with a Microchannel Fabricated using MEMS Techniques

Cited by 13 publications

References 22 publications

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

Safe, Durable, and Sustainable Self-Powered Smart Contact Lenses

Insights into the synergistic effect between nickel and molybdenum for catalyzing urea electrooxidation

An Unprecedented CeO2/C Non-Noble Metal Electrocatalyst for Direct Ascorbic Acid Fuel Cells

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